Ordering Process and Dynamics of "Ceramics"

“陶瓷”订购流程及动态

基本信息

批准号：
05452063
负责人：
MATSUURA Motohiro
金额：
$ 4.67万
依托单位：
Kyoto Institute of Technology (KIT)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

"Ceramics" are not only popular and familiar materials in our daily life but also essentialy important one for the modern frontier science and technology. Strucuturally, it is composed of grains of a single crystal which are strongly coupled to each other through an intermediary random surface. "Regularity" and "irregularity" coexist with different geometrical scales in such a material, the essense of which is characterized by a heterogeneous hierarchical structure. In order to study the ordering process, it is essential to examine the dynamical aspect of so called mesoscopic clusters of 10^<-2 3>A.We have, therefore, developed an high-sensitive observation system of nonlinear magnetic responses to an excitation AC field of a wide frequency range from sub-mili up to kiro Hz and of a wide range of amplitude variable from mili to kiro Oe. Then, we have applied it to oxide high-Tc superconductors, graphite intercalation compounds and so on and studied the ordering processes and the dynamical aspects. The experimental results on CoCl_2-GIC and NiCl_2-GIC revealed that nonlinear response is an efficient probe to investigate the nature of hierarchical successive transitions and the dynamical structure os intermediate phase in such "ceramics". In our study, the hierarchical superconductive transitions from intra-to inter-grain direction was first well distinguished separately. The nonlinear response was then found to show different singularitioes at these transition points. From the facts, nonlinear susceptibility has been proved to be an important probe which distinguishes a true superconductive glass from a so called gauge glass and thus to be an essential physical quantity to look after the nature of Josephson-type interactions or the microscopic origin of superconductivity.

“陶瓷”不仅是我们日常生活中受欢迎且熟悉的材料，而且对于现代边境科学技术来说，这也是重要的材料。从抗糖尿效果上讲，它由单个晶体的晶粒组成，该晶粒通过中间随机表面彼此强烈耦合。在这种材料中，“规律性”和“不规则性”与不同的几何尺度共存，其本质的特征是异质层次结构。为了研究订购过程，必须检查所谓的10^<-2 3> A的动力学方面。然后，我们将其应用于氧化物高-TC超导体，石墨插入化合物等，并研究了排序过程和动态方面。 COCL_2-GIC和NICL_2-GIC的实验结果表明，非线性响应是研究层次连续过渡的性质和此类“陶瓷”中的动态结构OS中间阶段的有效探针。在我们的研究中，首先分别区分了从晶粒内方向到晶粒间方向的分层超导过渡。然后发现非线性响应在这些过渡点显示出不同的奇异症。从事实来看，非线性敏感性已被证明是一个重要的探针，它将真正的超导玻璃与所谓的量规玻璃区分开，因此是照顾约瑟夫森型相互作用或超导性的显微镜起源的本质的必不可少的物理量。